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2,5-Diketopiperazine106-57-0100 % similar Hydantoin461-72-353 % similar Glycylglycylglycine556-33-248 % similar Thiohydantoin503-87-748 % similar 2-Azetidinone930-21-244 % similar Glycylglycine556-50-340 % similar 2-Pyrrolidone616-45-540 % similar 2-Piperidinone675-20-738 % similar Caprolactam105-60-236 % similar Enantholactam673-66-536 % similar Octahydro-2H-azonin-2-one935-30-836 % similar Laurolactam947-04-636 % similar Glycylglycine hydrochloride13059-60-436 % similar Isovalerylglycine16284-60-936 % similar Malonic dihydrazide3815-86-935 % similar Succinic dihydrazide4146-43-435 % similar 3-Morpholinone109-11-535 % similar 4-Hydroxy-2-pyrrolidinone25747-41-535 % similar N-Methylol-α-chloroacetamide2832-19-135 % similar Dihydrouracil504-07-435 % similar